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The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms. This transformation can be carried out via both biological and non-biological processes. Important processes in the nitrogen cycle includefixation, mineralization, nitrification, and denitrification. The majority of Earth's atmosphere (approximately 78%) is nitrogen, making it the largest pool of nitrogen. However, atmospheric nitrogen is unavailable for biological use, leading to a scarcity of usable nitrogen in many types of ecosystems. The nitrogen cycle is of particular interest to ecologists because nitrogen availability can affect the rate of key ecosystem processes, including primary production anddecomposition. Human activities such as fossil fuel combustion, use of artificial nitrogen fertilizers, and release of nitrogen in wastewater have dramatically altered the global nitrogen cycle.
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Nitrogen cycle, Soil biology, Metabolism, Biogeochemical cycle, Fishkeeping, Nitrogen, Nitrification, Denitrification, Mineralization, Nitrogen fixation, Chemical cycling, fossil fuel combustion, global nitrogen cycle, nitrogen fertilizers, nitrogen availability, atmospheric nitrogen, nitrification and denitrification, ecosystem processes, biological processes, scarcity, wastewater, atmosphere, transformation, pool, earth
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